Mayweather doesn't mind being hit on the shoulder, elbows, etc. ALso people are forgetting a big factor, and thats footspeed. Margarito is very limited when it comes to his ability to move, and he is not very good at all at cutting off the ring. Margarito would chase Mayweather around, but he would be too slow to close the gap, and people aren't realizing there is a reason why Margarito started off especially slow against Paul Williams, and htat was because Paul was moving too much, you can't throw punches unless you have the right distance, and if Floyd doesn't give that to Marg then he will never get the chance to throw punches. Also about MAyweather being the ropes, He was against HAtton, one of the fastest pressure fighters the sport has ever seen(how fast he closes the gap is truly amazing), and a great inside fighter, a guy who walked through MAyweather's punches for most of the fight, and a guy who didn't get a chance to throw punches because Mayweather didn't let him. Same with Oscar for a lot of the fihgt MAyweahter was using good lateral movement to keep the fight in the center of the ring, but even when Oscar had him on the ropes Oscar couldn't land anything throwing much better combinations then Margarito throws. Baldomir(the guy with Margarito's footspeed) was only able to get Floyd to the ropes a few times, and during those times Floyd dodged everything Baldomir threw because guys like Baldomir and Margarito are too slow to land on Mayweather)

Whereas Cotto cuts off the ring well, he has great instincts/timing, sharp/accurate punches, great body work when he uses it, He can handle Floyd's punch as well, he uses has a little better footspeed then Margarito, and he has an excellent jab which he always uses coming forward. I think Mayweather would still beat Cotto, but it would be a much more competitive fight.

People have been talking about the strength of every next opponent Mayweather will fight, but Baldomir was just as strong as MArgarito, and just as hard to hurt. Margarito does throw more punches, and he hits harder, but Mayweather has a great chin and durability for the few tiems he will get hit. Stop acting like Mayweather is made out of glass he has foughten a number of respectable punchers Corrales, Castillox2, Ndou, Gatti, Dela Hoya, Judah and none of them were able to dent him.